How can I invite my fiance to Canada if I am a Permanent Resident?

[Seerah]

Hi,
I am a Permanent Resident in Canada. I met this guy on Facebook and we instantly fell in love. He lives in the UK but he doesn't have his citizenship but only 5yr visa. Meaning he cannot travel unless you send him an invitation letter. Over the course of few months our families have met and we got engaged. I haven't met him in person, I know it sounds weird, but our families have exchanged the words -it is a Persian culture. For families to exchange words is more than serious than two individuals getting engaged.
Now I want to invite him. I am absolutely in love with him and I can't take it anymore to be away from him.
So my question is that how can I invite him?
What are the process and procedures?
Can I still invite him if I haven't met him yet although we are engaged?
Please help.
B